Take three test-tubes. Fill each other with water. Label them A, B and C. Keep a snail in test-tube A, a water plant in test-tube B and in C, keep snail and plant both. Which test-tube would have the highest concentration of Carbon dioxide.

Living organisms use oxygen and release CO2 during respiration.

Test tube A consists of snail which continuously uses the oxygen produced and releases carbon dioxide.

Hence, test tube A will have the highest concentration of carbon dioxide.

answer:

sequence 1- deletion

                  2- duplication

                  3- insertion

                  4- substitute

                  5- inversion

only about ten percent of the energy at one trophic level is passed on to organisms at the next trophic level. the remainder of the energy is used in life processes or lost as heat.